Fig. 5
Mean optical depth profiles for strongly polar molecules for the eight sources with N(DNM) ≳ 2 × 1020 cm−2. The HCN profile in green shows the kinematic structure that would be convolved with the HCN hyperfine splitting toreproduce the observations assuming that the hyperfine components appear in the LTE ratio 5:3:1. C2H is shown in blue.
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